/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id$
 */
package wx.xml.xalan.xalan.templates;

import wx.xml.xalan.xpath.Expression;
import wx.xml.xalan.xpath.XPathContext;
import wx.xml.xalan.xpath.objects.XObject;


/**
 * This is the same as XUnresolvedVariable, but it assumes that the
 * context is already set up.  For use with psuedo variables.
 * Also, it holds an Expression object, instead of an ElemVariable.
 * It must only hold static context, since a single copy will be
 * held in the template.
 */
public class XUnresolvedVariableSimple extends XObject {
    static final long serialVersionUID = -1224413807443958985L;

    public XUnresolvedVariableSimple(ElemVariable obj) {
        super(obj);
    }


    /**
     * For support of literal objects in xpaths.
     *
     * @param xctxt The XPath execution context.
     * @return This object.
     * @throws javax.xml.transform.TransformerException
     */
    public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException {
        Expression expr = ((ElemVariable) m_obj).getSelect().getExpression();
        XObject    xobj = expr.execute(xctxt);
        xobj.allowDetachToRelease(false);
        return xobj;
    }

    /**
     * Tell what kind of class this is.
     *
     * @return CLASS_UNRESOLVEDVARIABLE
     */
    public int getType() {
        return CLASS_UNRESOLVEDVARIABLE;
    }

    /**
     * Given a request type, return the equivalent string.
     * For diagnostic purposes.
     *
     * @return An informational string.
     */
    public String getTypeString() {
        return "XUnresolvedVariableSimple (" + object().getClass().getName() + ")";
    }


}

